ACELEPRYN AND DPX-HGW86 LIQUID APPLICATIONS FOR RESIDUAL SYSTEMIC BLACK CUTWORM CONTROL IN TURFGRASS, 2012

This study was conducted in summer 2012 to evaluate residual activity of several systemic insecticides for control of black cutworm (Agrotis ipsilon) in creeping bentgrass. Treatments were applied to an experimental block of creeping bentgrass maintained under putting green standards and located at the Oklahoma State University Turfgrass Research Center in Stillwater, Oklahoma. Plots measured 3 ft by 3 ft (9 ft) and were mowed at 0.155 inch and irrigated daily. Treatments consisted of the following insecticides: (1) Acelepryn (chlorantraniliprole) at 4.0 fl oz per acre; (2) Acelepryn at 8.0 fl oz per acre; (3) DPX-HGW86 20SC (cyantraniliprole) at 4.0 fl oz per acre; (4) DPX-HGW86 20SC at 8.0 fl oz per acre; (5) Acelepryn 1.67SC and DPX-HGW86 20SC at 4.0 fl oz per acre for each compound; (6) Meridian 25WG (thiamethoxam) at 17.0 oz per acre; and (7) Meridian 25WG and DPX-HGW86 20SC at 8.6 oz and 10.3 fl oz per acre, respectively. All treatments were compared against a non-treated check. All treatments and the non-treated check were replicated four times in a randomized complete block design. Treatments were applied mid-morning on May 8, 2012 with a CO2-pressurized (18 psi) wheelbarrow sprayer equipped with two TX8008 flat fan nozzles and calibrated to deliver 2.0 gal/1000 ft. All plots were irrigated with approximately 1/10 inch of water following insecticide application.